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- Schedule of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2019
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]      
Cash and cash equivalents   $ 16,581 $ 14,640
Restricted cash included in other long-term assets   19,995 $ 19,652
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 34,292 $ 36,576